Have `form-control-has-label` accept `accessibleDirectives` option

[vincerubinetti]

In anchor-has-content we can allow a Vue directive to take the place of content.

I have a custom v-tooltip directive that automatically adds an aria-label (or other appropriate aria prop) to the element, making it accessible at run time, but this plugin has no way of knowing that. Instead of disabling the rule globally or on specific lines, it'd be nice to have an option for this.

In fact, I wonder if more generally we can tell eslint to treat some prop e.g. v-whatever to act as a different prop e.g. aria-label.